The Impact of Cluster Structure and Dynamical State on Scatter in the Sunyaev-Zel'dovich Flux-Mass Relation

Yang, H. -Y.  Karen; Bhattacharya, Suman; Ricker, Paul M.

doi:10.1088/0004-637x/725/1/1124

Title: The Impact of Cluster Structure and Dynamical State on Scatter in the Sunyaev-Zel'dovich Flux-Mass Relation

Journal Article · Tue Nov 23 00:00:00 EST 2010 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637x/725/1/1124· OSTI ID:1564777

Yang, H. -Y. Karen ^[1]; Bhattacharya, Suman ^[2]; Ricker, Paul M. ^[3]

Univ. of Illinois, Urbana, IL (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Illinois, Urbana, IL (United States); National Center for Supercomputing Applications, Urbana, IL (United States)

Cosmological constraints from cluster surveys rely on accurate mass estimates from the mass-observable relations. In order to avoid systematic biases and reduce uncertainties, we study the form and physical origin of the intrinsic scatter about the mean Sunyaev-Zel'dovich (SZ) flux-mass relation using a hydrodynamical simulation of galaxy cluster formation. We examine the assumption of lognormal scatter and detect non-negligible positive skewness and kurtosis (>0.5) for a wide range of limiting masses and redshifts. These higher order moments should be included in the parameterization of scatter in order not to bias cosmological constraints. We investigate the sources of the scatter by correlating it with measures of cluster morphology, halo concentration, and dynamical state, and quantify the individual contribution from each source. We find that statistically the impact of the dynamical state is weak, so the selection bias due to mergers is negligible. On the other hand, there is a strong correlation between the scatter and halo concentration, which can be used to reduce the scatter significantly (from 12.07% to 7.34% or by ~40% for clusters at z = 0). Finally, we also show that a cross-calibration by combining information from X-ray follow-ups can be used to reduce the scatter in the flux-mass relation and also identify outliers in both X-ray and SZ cluster surveys.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC)

OSTI ID:: 1564777

Journal Information:: The Astrophysical Journal, Vol. 725, Issue 1; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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